<?php
// This file is part of BOINC.
// http://boinc.berkeley.edu
// Copyright (C) 2008 University of California
//
// BOINC is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// BOINC is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with BOINC. If not, see <http://www.gnu.org/licenses/>. 
//
// This file was modified by contributors of "BOINC Web Tweak" project.

function akismet_check( $user, $post ) {
	$config = get_config();
	$key = parse_config($config, "<akismet_key>");
	if (!$key)
		return true;

	$master_url = parse_config($config, "<master_url>");
	$master_url = urlencode($master_url);
	$response = akismet_request("key=$key&blog=$master_url", "rest.akismet.com", "/1.1/verify-key");
	if ( "valid" == $response[1] ) {
		$post = urlencode($post);
		$ip = urlencode($_SERVER['REMOTE_ADDR']);
		$referrer = urlencode($_SERVER['HTTP_REFERER']);
		$author = urlencode($user->name);
		$useragent = urlencode($_SERVER['HTTP_USER_AGENT']);

		$request  = "blog=$master_url";
		$request .= "&user_ip=$ip";
		$request .= "&user_agent=$useragent";
		$request .= "&referrer=$referrer";
		$request .= "&comment_author=$author";
		$request .= "&comment_content=$post";

		$response = akismet_request($request, "$key.rest.akismet.com", "/1.1/comment-check");

		if ( "true" == $response[1] ) // Akismet says it's spam
			return false;
		else
			return true;

	} else {
		return true; // invalid key
	}
}

function akismet_request($request, $host, $path, $port = 80) {
	$http_request  = "POST $path HTTP/1.0\r\n";
	$http_request .= "Host: $host\r\n";
	$http_request .= "Content-Type: application/x-www-form-urlencoded; charset=utf-8\r\n";
	$http_request .= "Content-Length: " . strlen($request) . "\r\n";
	$http_request .= "User-Agent: BOINC | Akismet 1.1\r\n";
	$http_request .= "\r\n";
	$http_request .= $request;

	$response = '';
	if( false !== ( $fs = @fsockopen($host, $port, $errno, $errstr, 3) ) ) {
		fwrite($fs, $http_request);
		while ( !feof($fs) )
			$response .= fgets($fs, 1160); // One TCP-IP packet
		fclose($fs);
		$response = explode("\r\n\r\n", $response, 2);
	}
	return $response;
}  

?>
